Method of making litharge.



UNITED STATES PATENT- OFFICE.

JAMES El SULLIVAN, OFOAMDEN, NEW JERSEY, ASSIGNOR TO N. Z. GRAVES C OMPANi, OF

PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA,

METHOD OF MAKING LITHARGE.

To (all whom "it may concern:

Be it known that I, J AMES E. SULLIVAN, a citizen of the United States, residing at Camden, in the county of Camden and State of New Jersey, hareinvented certain new and useful I]1111)10\*Glll01lt8 iuthe Method of Making Lithargc, of which the following is a specification.

My invention has relation to a method to utilize the by-product derived from manu facturing nitrite of soda for making mouoxid of lead, generallyknown as litharg'e.

It is a well known fact. that in reducing nitrite of soda mixed with metallic lead, assisted by heat, a by-product is derived, as oxid of lead. Hitherto this product has been ei'nployed in making red lead, requirinn about sixty hours time to complete such product. I have found that such a by product can be utilized. in very much less time, economically and etliciently, in the making of a fine character as well as quality of litharge and mechanically the litharge is expeditiously then brought into a powdered condition, for commercial use.

A preferred manner of carrying outmy invention consists in taking said by-product derived from the manufacture ofnitrite of soda, monoxid of lead Pb 0. after the following equation Na. NO,,-l-Pb:Na NO, and Pb O. and separating under any of several known processes, the monoxid of lead, by washing to free soluble impurities therefrom and then in due course conveyed to a drying furnace, wherein it is subjected to direct fire heat ranging from 900 to 1200 Fall. for a period of three hours, more or less, whence the mass is then removed, quickly cooled and then ground. After thorough bolting Specification of Letters Patent.

Application filed June 14, 1909.

PatefitedAug. 17, 1909.

Serial No. 501,982.

the litharge derived in a'uniformly powdercd condition,- is ready for thennarket, the production of the litharge notconsuming over ten hours, in the production thereof. The important feature of my present inven tion is the discovery that said by-product ol itained from manufacturing nitrate of soda, if taken and treated as hereinb'efore explained, in three'hours, more or less, barring the time of mechanical operations upon the same, gives a most excellent litharge, in a uniforn'ily powdered condition, for'commercial uses. v Y

Haring thus described the nature and object of" my invention,'what I claim as new and desire to secure by Letters Patent is I 1. The herein described method of making litharge, which con vs in subjecting monoxid of lead, the lay-product of the making of nitrite of soda, to a temperature ranging between 900 and 1200 Fa'h. during a period of but. a few hours, and then mechanically reducing the derived litharge.

The her '11 described method of making litharge, which consists in subjecting m0- noxid of lead to a temperature ranging between 900 and 1200 Fah. during a period of three hours, more or less, and then mechanically reducing the derived litharge to auniformly powdered commercial condition.

In witness whereof, I have hereunto set my signature in thepresence of two subscribing witnesses:

JAMES EL SULLIVAN,

'itnesses:

N.'Z. Gnavns, Jr., P. Ti, PERKINS. 

